Mohan said to Savita, "Can I borrow your book for a day?"
In Reported Speech the above sentence will be
Mohan asked Savita

Question

Accepted Answer

In the given question, Mohan is asking Savita if he can borrow her book for a day. When converting this direct speech into reported speech, certain grammatical changes are necessary to maintain the meaning and context of the original sentence. Let's analyze why Option 1 is the correct choice and why the other options are incorrect.

### Explanation for Option 1:
**Option 1: "Mohan asked Savita if he could borrow her book for a day."**

1. **Change of Pronoun:** In reported speech, pronouns often change to match the perspective of the speaker. Here, "I" changes to "he" because Mohan is referring to himself.
   
2. **Change of Tense:** The verb "can" in direct speech changes to "could" in reported speech. This is a standard rule in English grammar when converting from direct to indirect speech, especially when the reporting verb is in the past tense (asked).

3. **Use of "if":** When converting questions into reported speech, "if" or "whether" is used to introduce the reported clause. In this case, "if" is appropriately used to introduce the question Mohan asked.

4. **Maintaining the Original Meaning:** The sentence structure and word choice in Option 1 accurately convey the original meaning of Mohan's question in a grammatically correct manner.

### Explanation for Why Other Options are Incorrect:

**Option 2: "if they could borrow her book for a day."**

- **Incorrect Pronoun:** The pronoun "they" is incorrect because it does not refer to Mohan, who is the subject of the original sentence. The correct pronoun should be "he" to refer to Mohan.

**Option 3: "that could he borrow her book for a day."**

- **Incorrect Structure:** The use of "that" is inappropriate for introducing a question in reported speech. Additionally, the word order "could he" is incorrect for reported speech, as it should be "he could."

**Option 4: "if that he could borrow her book for a day."**

- **Redundant and Incorrect Use of "that":** The inclusion of "that" is unnecessary and incorrect in this context. The correct conjunction to introduce the question is simply "if."

In conclusion, Option 1 is the correct choice because it accurately follows the rules of converting direct speech into reported speech, maintaining the original meaning and context of Mohan's question.